本文介绍了Java中嵌套类的概念，包括静态嵌套类(static nested class)和非静态嵌套类(inner class)的区别与特点。非静态嵌套类依赖于外部类实例存在，并能访问外部类的私有成员。
nested classes 分两类，static and non-static.后者又叫inner class. 前者叫static nested classes.
class OutClass{
static class StaticNestedClass{}
class InnerClass{}
}
nested classes可以声明private, protected, package private(default), public.但是一般的class确只能声明为public或者package private. 因为nested class是最为class member 看待的。An instance of an inner class can exist only within an instance of its enclosing class and has access to its enclosing class's members even if they are declared private.
class OutClass{
static class StaticNestedClass{}
class InnerClass{}
}
nested classes可以声明private, protected, package private(default), public.但是一般的class确只能声明为public或者package private. 因为nested class是最为class member 看待的。An instance of an inner class can exist only within an instance of its enclosing class and has access to its enclosing class's members even if they are declared private.
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